Study On Effects And Mechanism Of Xos On Growth Performance Of Piglets

The experiment was conducted to assess the effects of xylo-oligosaccharides (XOS) on nutrient apparent digestibility,growth performance,rectum microflora,volatile fatty acid (VFA) production and intestinal enzyme activity of piglets.20 Piglets were randomly assigned to one of 5 dietary treatments with 4 replicates of 1 piglet each to study the effect of XOS on nutrient apparent digestibility of pigs . Results showed that supplementation of XOS (50,100,200 mg/kg DM) and aureomycin increased (P < 0.05) the apparent digestibility of CP and NDF in contrast to the control. The apparent digestibility of DM and GE was increased (P < 0.05) by addition of 100 mg XOS /kg DM, but was reduced (P<0.05) by supplementation of 100 mg/kg aureomycin compared with other treatments.400 Piglets were randomly assigned to one of 5 dietary treatments with 8 replicates of 10 piglets each to study the effect of XOS on growth performance of piglets.Results showed that all the piglets had the similar ADG and ADFI (P>0.05) but 40-80 mg XOS/kg DM decreased (P<0.05) F/G, and 40-200 mg XOS/kg DM reduced (P<0.05) the diarrhea rate compared to the control.Piglets were fed XOS with different dosages to assess the effects of XOS on rectum microflora,volatile fatty acid (VFA) production and intestinal enzyme activity of piglets. Results showed that piglets supplemented with XOS quadratically increased (P<0.05) NC of Lactic acid bacteria on d 7, d 21 and d 35.And NC of Bacillus was improved on d 7 when addition of 100 mg XOS/kg DM, no such change was found in the other dosage and periods in the experiment. However there was no effect (P>0.05) on NC of Salmonella and NC of Escherichia coli in the experiment.Increasing supplementation of XOS linearly (P<0.05) and quadratically (P<0.05) increased concentrations of acetic acid, propionic acid and butyric acid in the jejunum, ileum and cecum. Lipase activity was quadratically (P<0.01) increased in the duodenum, jejunum and ileum, trypsin activity was linearly (P<0.05) increased in duodenum and jejunum,as well as amylase activity was linearly (P<0.05) increased in the ileum with the increasing supplementation of XOS. In conclusion, supplementation of XOS on appropriate dosage improved energy and nutrient utilization, improved rectum microflora, as well as increased volatile fatty acid production and enzyme activity in the intestinal tract of piglets and reduced the incidence of diarrhea and increased growth performance.